Method of making tires



Jan. 2!, 1930.

V. C. ANDERSON METHOD OF MAKING TIRES Filed Sept. 26, 1927 V INVENTOR.

BY Wm +601 ATTORNEYS.

Patented Jan. 21, 1930 UNITED STATES PATENT orrlca vmen. c. mnnnson, or enema, wnsnme'ron METHOD OF MAKING TIRES Application filed September 26, 1927, Serial 1T0. 222,134, and in Canada September 1, 198 7.

. I My present invention relates to an imroved method of making tires, and especially or building up the tread portion of pneumatic tires as used on automotive vehicles.

By the utilization of the steps of my invention in the manufacture of tires, the durability of the tire is enhanced, and a nonskid wear surface is provided for the tread of the tire, to prevent lateral slipping.

In carrying. out my invention I utilize vulcanizable rubber and woven fabric, the latter arranged in sheets alternating with the layers of rubber, and the finished tire comprises a tread portion made'up of alternate annular fabric rings having their exterior annular edges exposed, and alternate layers or webs of rubber with their exterior annular edges exposed. The tire is thus provided with a tread of unvulcanized rubber having therein a series of spaced'tread rings fashioned from fabric and arranged on edge with their exterior edges exposedfland adapted to wear with the exposed rubber.

' In the accompanying drawings I have illustrated one comfplete example of the physical embodiment o the steps of the process are carried out and the treadslab vulcanized to the tire casing.

1 a Figure. 1'- is a perspective view showing a block of rubber having embedded therein sheets or layers of fabric, and showing by dotted lines the manner of cutting tread-slabs from this block; 1 1

Figure 2 as a, detail view showing by dotted lines a cross section of a tire casing with the tread of my invention vulcanized thereto and 1 also shown in cross section.

a In carry-ing out my invention I first fashion a block of re-inforced rubber as in Figure 1 comprising an upper layer 1 and a lower a layer 2 of rubber, and, between these two layers are embedded successive,spaced sheets of fabric as 3, forming therebetween intermedi ate spaced layers 4 of rubber. At the longitudinal center of theblock, I preferably use a central layero of rubber havin a contrastin color, as red, for instance, that orms' a colore band12around the completed tire.

., By the'emplo ent of suitable machinery on tools, this b ock is fashioned intoslabs,

my'invention showing how whose shape, widthand thickness are defined by the straight dotted lines6 and curved dotted lines 7 in Figure 1. These "slabs are cut in length corresponding to the exterior circumference of peri hery of thetire ,casin 8. indicated by dotted lines in Figure12 and a slab is vulcanized to the tire casing to form the tread portion of the casing. The flat face 6 of the slab is vulcanized to the tire leasing, and the curved face 7 becomes the tread surto face with the tapered edges-9 and 10'extending well around the opposite side walls 11 of the casing 8. v

In Figure 1 it willbe seen that the'slab is out on the lines 6 and 7, which linesextend at right angles to cram perpendicular to the parallel planes of the sheets or fabrics 3, the intermediate layers 4 and thecentral colored layer 5. By this mode of cutting the block into slabs, the tread slabs are fashioned with 7 a central rubber treadring (colored) 12, spaced edge rings 13 of fabric,' and alternate, spacedwebs .14 of rubber-Q1 i The exterior curvature "of'the tread slab is made to conform to thei'contourof-the tire tread, and the edges of the ringsldfandwebs 14; present wear surfacesfor the tread .thatare durable, and that will beinstrumentalinpreventing skidding or lateral slippingflof the tire when in use. i l i Iclaimi v' 1. The process of making a tire' which consists in forming a blockof alternate sheets of rubber and fabric material to :a height sub stantially equal'to the width of a 'tire, in slicing the block transversely relative to the 7 sheets to form tread slabs and in vulcanizing a slab to a tire casingiwith' the outer edges of tlie sheets forming thewear face; off the trea i" 'f 2. The process of making atiretr'ead which consists informing a block of alternate sheets of rubber and fabric material to'a height substantially equal to the width of a tire'andin I slicing the block transversely relative to. the 95 sheets.- -v 1 v 3. The process of'making' a tire tread which consists in forming a blockfoff alternate "sheets of rubber and fabric niatei'ial'jand in cutting slabs from saidblock transversely to 1 the sheets, the slabs being defined in cross section by a straight line and an arc.

4. A tire tread comprising a central section of annular fabric tread rings and alternate annular rubber tread webs having their edges forming the wear surface of the tread and the tire tread being defined in cross section by a straight line and by an arc.

VIRGIL c. ANDERSON. 

